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| author | Olof Johansson <olof@lixom.net> | 2012-09-05 15:35:48 -0700 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2012-09-05 15:35:48 -0700 |
| commit | 1875962377574b4edb7b164001e3e341c25290d5 (patch) | |
| tree | 374a5299403ec21e2d9a66a6548ce876a388b589 /drivers/net/ethernet/sfc/tx.c | |
| parent | 5cbee140a28c2746449ae31e85738043ae4da927 (diff) | |
| parent | c88a79a7789b2909ad1cf69ea2c9142030bbd6f4 (diff) | |
| download | op-kernel-dev-1875962377574b4edb7b164001e3e341c25290d5.zip op-kernel-dev-1875962377574b4edb7b164001e3e341c25290d5.tar.gz | |
Merge branch 'soc-core' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/dt
* 'soc-core' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
ARM: mach-shmobile: Add compilation support for dtbs using 'make dtbs'
+ sync to 3.6-rc3
Diffstat (limited to 'drivers/net/ethernet/sfc/tx.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/tx.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c index 9b225a7..1871343 100644 --- a/drivers/net/ethernet/sfc/tx.c +++ b/drivers/net/ethernet/sfc/tx.c @@ -119,6 +119,25 @@ efx_max_tx_len(struct efx_nic *efx, dma_addr_t dma_addr) return len; } +unsigned int efx_tx_max_skb_descs(struct efx_nic *efx) +{ + /* Header and payload descriptor for each output segment, plus + * one for every input fragment boundary within a segment + */ + unsigned int max_descs = EFX_TSO_MAX_SEGS * 2 + MAX_SKB_FRAGS; + + /* Possibly one more per segment for the alignment workaround */ + if (EFX_WORKAROUND_5391(efx)) + max_descs += EFX_TSO_MAX_SEGS; + + /* Possibly more for PCIe page boundaries within input fragments */ + if (PAGE_SIZE > EFX_PAGE_SIZE) + max_descs += max_t(unsigned int, MAX_SKB_FRAGS, + DIV_ROUND_UP(GSO_MAX_SIZE, EFX_PAGE_SIZE)); + + return max_descs; +} + /* * Add a socket buffer to a TX queue * |
